Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Financial Instruments (Narrative) (Details)	1 Months Ended
Financial Instruments (Narrative) (Details)	Aug. 31, 2017 USD ($) a	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of acres \| a	6
Proceeds from sale of property	$ 12,200,000
Promissory note received in sale of land	$ 5,700,000
Interest rate on promissory note	3.50%
Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, face amount		$ 375,000,000	$ 375,000,000